Concrete and shuttering floor structure



June 17, 1952 w: ASHMAN 2,601,082

CONCRETE AND SHUTTERING FLOOR STRUCTURE I Filed April 25, 1946 2 SHEETSSHEET l H. w. ASHMAN CONCRETE AND SHUTTERING FLOOR STRUCTURE Fiied April 25, 1946 June 17,1952

2 swims-SHEET 2 MW mm A m M M m 6 H Patented June 17, 1952 CONCRETE AND TEB NG LOOR STRUCTURE Herbert William Ashman, Hale, England, assignor to K y & Mattison m any. AmblcnPa-i a corporation of Pennsylvania Application April 25, 1946, Serial N 0, 654,896 In. Great Britain May 14; 1945 2 Claims. 1,

Th s invention relates to shutt n o mould d units for use in. icr ins u s me.

Informing fiat; or inclined concrete floors and roofs enemetb d in use s to provide shuttering which r main permanently n pos after t concretehas set for the purpose of providing both openoured channels whi r ce ve s me of the concrete and. thus form stiffening joists or ribs, and air cavities which provide thermal insulation. In addition the shuttering is used to form a substantially flat surf e n he nd rside and so to constitute the ceiling of the room below. This shuttering is composed of rows of units, which may be made from asbestos-cement or similar preformed sheet material, and some existing units are so shaped that the channels are formed by the assembly of two units side by side in a row, the units and channels in each row being aligned with those in the other rows. However the existing units cannot easily be moulded from flat sheets. 7

One object of this invention is to provide improved formsof unit which can be moulded from flat sheets.

Another object is to provide improved shuttering for the purpose set forth above- In principal, I use moulded uni s having fil parts extending from parts formed with one or more inverted troughs, the units bein assemb bled together in rows so that in successive units in a row the flat part of each extend beneath an inverted trough in the next to form a cavity, the successive flat parts present a substantially continuous flat undersurface and the channels are formed between the upper surfaces of invertedtrough walls. The two inverted-trough walls forming the sides of a channel may be made in a single unit, or each channel may be formed between the outer end wall of one inverted trough and the inner end wall of an inverted trough of the next unit. In either case the units individually enclose no cavities, these cavities being formed by the overlapping of adjacent units.

The invention will be more readily understood by reference to the accompanying drawings, which show two forms of shuttering composed of moulded units according to the invention and in which:

Figure 1 is a fragmentary view of one kind of shuttering before the pouring of the concrete;

Figure 2 is a vertical cross-section through the shuttering after the pouring of the concrete; and

Figure 3 is a similar cross-section through shuttering formed from modified units.

Referrin first to. Figure 1, the shuttering is formed from rows. of identical units I moulded from asbestos-cement sheets and put in pos tion on joists I5. Each unit is about twice as long as it is wide, and in len th it is Jus ua to he distance between the center lines of adjacent joists. The units are laid side by side to form a row spanning the space between adjacent joists, s shown in Figure l, and as many ow are laid as. are required to. form the d red re orfloor.

As is more learly sh wn n Fi u e eac u uts of a flat n :t 2 ormed with n lined bent-up lip 31 and mergin i to a na r er inverted trou h har formed by a sub an a y ertical; wall l. a flat crest 5 and a s co d su stant ally vert cal wall 6 which in turn merges nto a ho izon al lip l, The uni s are lai with theinvertcd trou h part of each n t app n fiat part of the and he p 3 f each unit lyin flat a a nst he nn r Wall 4 of the unit, The wall 6 is f less d pth ha th wall s by the hic ness f th materi a d the under urfaee f lip l lies n he am p a t upp r surface of t e lat par s the lip l of each uni rests fi mly n the, f a p t of the It will be seen hat a s r es of cavities 8 is. formed in he shutterin Fu he t e sp between. the Walls l nd i o ad acent units r open-tonped channels narro r at he t p than their bottoms a the walls 4 and it which bound them are inclined for this purpose.

When the shuttering has been put in position concrete is poured over the fiat crests 5 and into the channels to form a flat covering 9 with stiffening joists or ribs 10, in which reinforcement H may be embedded in the usual way. These ribs It serve to key the units in position so that they need no permanent support and except at the ends of the roof the joists I on which the units are laid may be temporary. The shuttering, as will be seen from the drawing, presents a substantially flat and continuous undersurface.

Referring now to Figure 3, the modified units used have inverted trough parts which are wider than the flat parts 2, each inverted trough part comprising an inclined wall I2, a flat crest I3 and an inclined wall [4, these walls defining one inverted trough. The wall 14 forms one wall of a channel having a base [6 which merges into the second wall I! of the channel, so that the channel is formed in a single unit instead of by the juxtaposition of two units as in Figure 1. The wall I! merges into a flat top [8 of a second inverted trough part, the second wall of which is formed by a lip l9 which engages over the inverted trough (bounded by the walls [2, l3 and [4) in the adjacent unit. It will be appreciated that the lip I9 could be extended downwards further or could be omitted altogether, but it is advantageous to provide it since it both helps in the location of each unit relatively to the next and by providing an overhanging edge keys with the concrete ribs I formed in the channels.

To make the undersurface of the shuttering substantially fiat and continuous a step 20, equal in depth to the thickness of the material, is provided between each flat part 2' and wall I2.

In the construction shown in Figure 3 the crest l8 of the second inverted trough is wider than the crest l3 of the first inverted trough and also lies in a plane higher by the thickness of the material, so that this crest I8 both forms the top of a cavity 8' and is supported by the next crest 13. This presents the advantage that the unsupported width of the crest I8 is less than that of the corresponding crest in the construction shown in Figure 2 with the result that any heavy load or impact to which a unit maybe subjected before the concrete is put in place is resisted better.

I claim:

1. In a joist supported shuttering assembly having a continuous flat undersurface forming a ceiling resting on said joists and having in its upper surface spaced parallel troughs for receiving a cementitious material, the combination comprising a plurality of identical asbestoscement sheets arranged on said joists in serial overlapping relation, said sheets having flat coplanar portions disposed edge to edge to form the continuous ceiling, each sheet further havnext sheet, said flange forming a flat web connecting adjacent troughs, one wall of said upwardly arched portion being spaced substantially equidistant from the confronting walls of adjacent troughs and forming a reinforcing member underlying and supporting said web intermediate its edges.

2. In a joist supported shuttering assembly having a continuous flat undersurface forming a ceiling resting on said joists and having in its upper surface spaced parallel troughs for receiving a cementitious material, the combination comprising a plurality of identical asbestos cement sheets arranged on said joists in serial overlapping relation, said sheets having fiat coplanar portions disposed edge to edge to form the continuous ceiling, each sheet further having a corrugated portion extending from one edge of that sheet over the flat portion of the next sheet and of substantially equal width therewith, said corrugated portion comprising a flat crested arch and a flat bottom trough contiguous therewith, one wall of said arch extending diagonally upward from the flat portion of the sheet and. the other Wall of said arch being a common wall for said arch and trough, the bottom of said trough being parallel to the plane of said flat portion and displaced upwardly therefrom by the thickness of said material, and a flange extending horizontally from the free edge of said trough and resting on the flat crest of the arch of the next sheet, said flange terminating at the common wall and provided with a downturned lip engaging said wall thereby forming a flat web between adjacent troughs, the other wall of said arch being spaced substantially equidistant from the confronting walls of adjacent troughs and forming a diagonal reinforcing member underlying and supporting said web intermediate its edges.

HERBERT WILLIAM ASI-IMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,109,785 Reier Sept. 8, 1914 1,508,871 Bloedow Sept. 16, 1924 1,679,947 Sanborn Aug. 7, 1928 1,872,984 Land Aug. 23, 1932 1,986,999 Burgess Jan. 8, 1935 2,065,920 Clark Dec. 29, 1936 2,131,652 Young Sept. 27, 1938 2,180,504 Bradfield et a1. Nov. 21, 1939 2,424,080 Engstrom July 15, 1947 FOREIGN PATENTS Number Country Date 5,876 Great Britain 1904 747,397 France 1933 498,590 Great Britain Jan. 11, 1939 

